tues_or_thurs = {'h':'thursday','u':'tuesday',}
weekend = {'a':'saturday','u':'sunday'}
week = {'t':tues_or_thurs, 's': weekend,
        'm':'monday', 'w':'wensaday',
        'f':'friday'}
first_char = input('请输入第一位字母:').lower().strip()
if first_char in ['a','t','s','m','w','f']:
    if week[first_char] == tues_or_thurs or week[first_char] ==weekend:
        second_char = input('请输入第二位字母:').lower().strip()
        if second_char in ['u','h','a']:
            print(week[first_char][second_char])
        else:
            print('请输入正确字母')
    else:
        print(week[first_char])
else:
    print('请输入正确的字母')
